Carburetor



June 1,- 1937. Y C ROBINSON 2,082,514

GARBURETOR Filed Jan. 6, 1956 3 Sheets-Sheet l Patented June 1,, 1937 UNITED STATES PATENT OFFICE CARBURETOR Ivan Chance Robinson, Ferguson, Mo.

Application January 6, 1936, Serial No. 57,723

3 Claims.

My invention relates to improvements in carburetors in which a plurality of mantles are secured to a mantle support attached to a spray nozzle with a plurality of high velocity air passages; and the objects of my improvements are, first, to provide a spray nozzle that will vaporize Without heat, any liquid fuel that flows freely; second, to afford facilities for a cooling system that will keep the vapor cool until it reaches the combustion chamber; and third it is a further object of this invention to produce a generally new and improved structure of the above described character.

The invention will be better understood upon reference to the following description and claims and the accompanying drawings, in which:

Figure l is a plan View partly in section, and with portions of the cover plate broken away.

Figure 2 is a vertical section approximately on the line 2-2 of Figure 1 and Figure 4.

Figure 3 is a vertical section on the line 3-3 in Figure 2 illustrating the fuel inlet valve regulating mechanism.

Figure 4 is a vertical sectional View approximately on the line 4-4 of Figure 1.

Figure 5 is a horizontal section taken on the line 5-5 of Figure 4.

Figure 6 is a left end elevation..

Figure 7 is a plan view of the mantle support on a reduced scale.

Fig. 8 is a diagrammatic sectional view of the carburetor.

The carburetor comprises a main body of three members I, 2 and 3. The member I has an outlet passage 1. This outlet is surrounded by a flange 8 which is provided with bolt poles at |8--|0 as shown in Figure 6, or any suitable means by which it may be attached to the manifold on an internal combustion engine. 1

A butterfly throttle 4 mounted in conventional manner upon a shaft 5 is provided and an operation arm 6 is attached to the shaft 5 for operation by any suitable means.

The upper part of member of the carburetor is expanded to size sufiicient to receive member 2 and is sweated on at 9.

Member 2 is a circular wall having a fuel bowl support I2, extending through the side inwardly to the center with an upper and lower pro- 50 jection inside of the wall and a crossbar with a lower projection outside of the wall.

The fuel bowl support has two horizontal bores I9 and 20. The upper inside projection N forms the nozzle support with a vertical bore I3 5 communicating with the horizontal bore I9. The lower inside projection 2| has a vertical bore 15 communicating with the horizontal bore 20' and the outside projection 23 has a vertical bore '24 communicating with the horizontal bore 20.

"60 The "cross bar of the fuel bowl support on the outside of the wall of member 2 has a horizontal bore I90: directly across the path of bore IS. The outside openings in the horizontal bore |9a are plugged with bore plugs AI and A2 as shown in g Figure 2. 5

The outside openings in the bores l9 and .29 are plugged with bore plugs A3 and A4 as shown in Figure 4.

The outside of the wall of member 2 is threaded at the top so as to receive member 3 at 22. 1 Member 3 is a circular wall threaded on the inside at the bottom and screwed down on the top of member 2.

The spray nozzle I1 is round with an opening in each end and a horizontal partition about the 15 middle. A flange around the top end has a plurality of high velocity air passages 25 in the flange as shown in Figure 5. Sleeve bolt I6 has a plurality of small openings 30 in its sides and is threaded on the end so as to receive nut l8. It 20 passes down through the opening 29 in the top of the spray nozzle through an opening in the partition, then down through the bore l3 of the spray nozzle support I through the partition between bore l9 and 2|] of the fuel bowl support f 2. 25 The nut I8 is inserted into the bore l5 of' the lower projection 2| of the fuel bowl support and is then screwed on the end of sleeve bolt |6 with a gasket between the nut and the partition. In this manner the spray nozzle is held in place on a 30 perfect fit on the top of the spray nozzle support.

Gaskets are so arranged in the upper and lower openings in the spray nozzle so as to form an air tight connection between the head of the sleeve bolt and the partition, the upper end of 35 the spray nozzle support and the partition.

The lower cap 26 screws into the bore I5 of the lower projection 2| making the end of the bore air tight.

The upper cap l4 screws into the top opening 40 in the spray nozzle making it air tight. This cap has a threaded opening in the center through which the adjustment pin 27 passes. The pin is locked in position by lock nut 28.

The adjustment pin has a vertical bore 3| part way through the center with a plurality of small openings 32 to correspond in number with the openings in sleeve bolt l6. By this novel arrangement the speed and power can be increased or decreased at will by increasing or decreasing the fuel supply.

The spray nozzle has a plurality of small openings m0 passing through the wall of the air chamber 29 in the top of the spray nozzle just below the flange and directly in the path of the high velocity air passages 25 in the flange. The top of the spray nozzle is threaded at 33 so as to receive the'mant'le support 34. The mantle support is arranged with offsets on the underside so as to provide a' perfect fit for the mantles 35 and tion.

36 and when screwed down on the spray nozzle it comes down on member 3 of the main body and by application of a gasket forms an air tight connection between the mantle support 34 and member 3 of the main body.

The mantle support has a large opening 81 down through the center and a plurality of high velocity air passages 88 as shown in Figure 7. The large opening is threaded in the top so as to receive the idling mantle 4| at 44 and at the bottom so as to receive the spray nozzle I! at 33 as shown in Figure 4. The high velocity air passages 88 in the mantle support pass down through between the partitions of the mantle support into the cool air chambers 31 and 38 formed by the mantles 35 and 36. Mantles 35 and 36 are held in place at the top end on offsets provided on the under side of the mantle support and rest against the top side of the fuel bowl support at the bottom end.

Mantle 35 forms a partition between the vaporizing chamber 39 and the cool air chamber 38 and mantle 36 forms a partition between the cool air chamber 38 and the cool air chamber 31. The chamber 40 between the lower end of the mantles and the butterfly throttle is the mixing chamber where the vapor from the vaporizing chamber 39 and the cool air from the air chambers 31 and 38 mix before being drawn into the combustion chamber through the passage 1 of chamber I and the passage in the manifold.

Collar 52 is threaded so as to receive the idling mantle 4| before it enters the mantle support at 44 and holds the revolving air valve 43 in posi- This air valve has a plurality of high velocity air passages 53 as shown in Figure 1 that register with the high velocity air passages 88 as shown in Figure 7 when the air valve is open.

The idling butterfly choke 45 mounted in a conventional manner upon a shaft 46 is provided, and an operating arm 47 is attached to the shaft 46 for'operation by any suitable means.

The revolving air valve 43 has a plurality of high velocity air passages 53 through the valve and a quarter gear 49 on the top so as to register with gear 48 mounted on the idling butterfly choke shaft 46 as shown in Figures 1 and 4. Arm 41 on shaft 46 is connected to arm 6 on shaft 5 by connecting rod 5|, so that, as the butterfly throttle 4 mounted on shaft 5 opens and closes the butterfly choke 45 mounted on shaft 46 will open and close at the same time. The purifier may be omitted.

The fuel bowl is a double bowl, a partition Wall IUI dividing it into two compartments 54 and 55, A vaporizing pump 56 on the side of bowl has a horizontal cylinder bore H to receive the piston 13. The piston connects to piston rod 12 which passes through the cylinder cap 83 in the center. The bore H is threaded at 85 so as to receive the cylinder cap 83. This cap has a plurality of small air passages 84 and the cylinder has an opening in the back 89. This opening in the back is threaded at 86 so as to receive the connecting elbow 14 as shown in Figure 1.

Connecting elbow 16 that is screwed into the bore 24 of the outside projection 23 of the fuel bowl support I2, is connected to elbow 14 by pipe 15, making a complete connection between the vaporizing pump and the air chamber 29 in the top of the spray nozzle, as shown in Figure 2 and Figure 4.

The piston in the vaporizing pump can be operated by a rod connection 1'! to the instrument board or any other suitable means. The fuel bowl is secured to the fuel bowl support l2 by means of two valve seat screws BI and 62. Each valve seat screw has two seats, one in the center opening and one around the outside on the top of the head. Needle valves 58 and are seated in the inside seat of the valve seat screws 6| and 62 and pass up through threaded openings in the cover plate 82 and lock in position with lock nuts 18 and 19. Sleeve valves 51 and 59 around the needle valves 58 and 60 are seated on the outside seat of the seat screws 6| and 62 and are held in position by valve springs 90 and 9|.

The sleeve valve levers 63 and 64 have forked ends around under the flange on the sleeve valves and pass up through openings in the cover plate 82 then through forked openings in the double rocker arm 59 and are held in position by the double lock nuts 89 and 8|. The double rocker arm 56 is mounted on the idling butterfly choke shaft 46 and as the butterfly choke is opened the rocker arm forces the sleeve valve lever in one of the fuel chambers upward While the other lever is forced downward in the other fuel chamber by the sleeve valve spring.

When the butterfly choke is closed the other sleeve valve lever is forced upward by the rocker arm, While the other lever is forced downward by the other sleeve valve spring. By this novel arrangement the engine switches from one fuel to the other.

Fuel is supplied to the fuel chambers 54 and 55 in the fuel bowl from conventional pumps, (not shown) or other suitable means.

Pipe connections 92 and 93 receive the fuel and deliver it to the passages 94 and 55 in the cover plate 82 as shown in Figures 1 and 3. Vertical bores 96 and 91 in the cover plate communicate with the interiorof the chambers in the fuel bowl. Valve seat members 61 and 68 are threaded into bores 96 and 91 and needle valves 69 and 10 are mounted to seat in the members 61 and 68 to control the admission of the fuel to the carburetor bowl as shown in Figure 2.

The two conventional floats 98 and 99 in the fuel chambers 54 and 55 as shown in Figure 1. described separately as a conventional float 99 pivoted to member 68 operates the valve as shown in Figure 3, thereby maintaining a. fuel level in the carburetor substantially at the line BB as shown in Figure 4. Fuel being supplied to the carburetor through the connections 92 and 93 is maintained at substantially the level BB by the float mechanism in a conventional manner.

The fuel passes through the valve seat screws 6| and 62 into bore I9 and then from bore 19, up into bore l3 of the nozzle support ll, overflows through the holes 30 in the sleeve bolt down through the center opening in the sleeve bolt into bores l528 and 24 in the fuel bowl support through elbow 16 into pipe 15 up to the same level as in the fuel bowl.

When the engine is to be started cold the vaporizing pump piston II is forced backward and forward the fuel being forced out of the overflow conduit into the air chamber 29 in the top of the spray nozzle ll. Then out through a plurality of openings H10 in chamber 29 in the form of vapor into the high velocity air passages 25 in the spray nozzle. The piston in the vaporiz ing pump is above the fuel level in the sleeve bolt conduit and as it is forced forward it forces compressed air through the fuel conduit in the sleeve bolt and by this compressed air passing through the sleeve bolt conduit out through the small aosas 14 member I into the manifold then into the combustion chamber.

It will be noted that the carburetor has a fuel bowl with two chambers 54 and 55, valve seat screws GI and 62, needle valves 58 and 60, sleeve valves 57 and 59, levers 63 and 54 passing up through cover plate 82 into the rocker arm forks on rocker arm 59. The rocker arm being mounted on shaft 46 of the idling butterfly choke 45 makes it possible for the engine to change from one fuel to the other. It will also be noted that the mantle support has a plurality of high velocity air passages 88 down through the mantle support covered by an air valve 43 having a plurality of high velocity air passages 53 making it possible to regulate the amount of air and the velocity of the air currents through the passages in the mantle support.

It will be understood that the butterfly choke 45 mounted on shaft 45 in the upper idling mantle 4| above the mantle support 34 will control the amount of suction and the velocity of the air current that passes through the air ports 25 in the spray nozzle.

The above controls are accomplished by the connection between the accelerator in arm 6 of the butterfly throttle 4 the connecting rod 51 arm 41 of the idling butterfly choke 45. The gear 48 mounted on shaft 46 so as to register with the quarter gear 49 that is on the top of the air valve 43. When the engine is running at moderate speed the throttle valve 4 is partly open and consequently the choke 45 and the air valve 43 are partly open. Hence, air is supplied to the engine cylinders through the high ve-.

locity air passages 25 in the spray nozzle that pass into the vaporizing air passage 39 as well as through the cool air chambers 31 and 38.

The entire fuel supply, however, when run ning at moderate speed is supplied from chamber 54 of the fuel bowl through the passage in the valve seat screw 62, passage I9A, I9, 39, 3|, 32 and I90 into a direct path of the high velocity air passages 25 in the spray nozzle.

If it is desired to accelerate the speed of the motor the throttle valve 4 is opened wider causing the rocker arm on shaft 45 to raise the sleeve valve 5! in chamber 55 in the fuel bowl. This allows the fuel to escape through the passage in the valve seat screw 6| into passage l9A, I9, 39, 3|, 32 and H19 and allows more liquid fuel to pass out of the spray nozzle into the direct path of the high velocity air passages 55 in the spray nozzle and thence through the vaporizing chamber 39 into the mixing chamber 49 then into the engine cylinder.

In this manner I can obtain a construction in which the liquid fuel can be vaporized without heat to the highest degree and kept in a coo-l state until it reaches the combustion chamber. By so doing I obtain the highest degree of power and efliciency.

I claim:-

1. A carburetor adapted to be connected to the intake manifold of an internal combustion engine, said carburetor being provided with a mixing chamber having a vaporizing air inlet passage, a plurality of cooling air inlet passages around said vaporizing air inlet passage, a vaporizing nozzle having a plurality of small vaporizing air passages in said vaporizing air inlet passage, a choke valve for controlling the amount and velocity of the air that passes through said vaporizing air inlet passage through said vaporizing air passages in said vaporizing nozzle into said mixing chamber, an air valve for controllingthe amount and velocity of the air that passes through said cooling air inlet passages into said mixing chamber, a throttle valve for controlling the amount of fuel that passes into the intake manifold and the suction in the different air inlet passages when the engine is in operation, a manually operated means for the operation of said choke valve and said air valve in conjunction with said throttle valve.

2. A carburetor provided with a mixing chamber having a vaporizing air inlet passage a plurality of cooling air inlet passages around said vaporizing air inlet passage, a vaporizing nozzle having a plurality of small vaporizing air passages in said vaporizing air inlet passage held in position by a sleeve bolt with a fuel duct adapted to supply fuel to said vaporizing nozzle, a fuel bowl with two chambers adapted to the use of different fuels, a vaporizing pump attached to one of the chambers, a fuel duct leading from each of said chambers into one main fuel duct that surrounds said sleeve bolt, an adjustable fuel valve in said sleeve bolt when manually operated regulates the amount of fuel passing from said main fuel duct into said fuel duct in said sleeve bolt, a fuel duct leading from said sleeve bolt into said vaporizing pumpsaid vaporizing pump upon being manually operated forcing air and fuel out through the openings in side wall of said vaporizing nozzle'intothe direct path of said vaporizing air passages in said vaporizing nozzle.

3. A carburetor provided with a mixing chamber having a vaporizing air inlet passage, a plurality of cooling air inlet passages around said vaporizing air inlet passage, a vaporizing nozzle having a plurality of small vaporizing air passages in said vaporizing air inlet passage held in position by a sleeve bolt with a fuel duct adapted to supply fuel to said vaporizing nozzle, a fuel bowl with two chambers adapted to the use of different fuels, a vaporizing pump attached to one of said chambers, a fuel duct leading from each of said chambers into one main fuel duct that surrounds said sleeve bolt, an adjustable needle valve seated in said fuel ducts in each of said fuel chambers surrounded by a sleeve valve, a mechanism manually operated for the closing of one of said sleeve valves in one of said chambers and opening said sleeve valve in the other said chamber thereby controlling the change in the different fuel supply and being operated in conjunction with said choke valve, said air valve and said throttle valve.

IVAN CHANCE ROBINSON. 

